Spa shell



FIG. 1 is a perspective view of a spa shell showing our design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a cross-sectional view taken along 3—3 of FIG. 2;

FIG. 4 is a cross-sectional view taken along 4—4 of FIG. 2;

FIG. 5 is a cross-sectional view taken along 5—5 of FIG. 2; and,

FIG. 6 is a cross-sectional view taken along 6—6 of FIG. 2.

The broken lines in the drawings represent unclaimed portions of the spa shell and form no part thereof. 

The ornamental design for a spa shell, as shown and described. 